CN115323158A - Method for improving productivity of heating furnace of hot continuous rolling production line - Google Patents
Method for improving productivity of heating furnace of hot continuous rolling production line Download PDFInfo
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- CN115323158A CN115323158A CN202211010483.4A CN202211010483A CN115323158A CN 115323158 A CN115323158 A CN 115323158A CN 202211010483 A CN202211010483 A CN 202211010483A CN 115323158 A CN115323158 A CN 115323158A
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- flue
- section
- heating furnace
- heating
- preheating section
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/70—Furnaces for ingots, i.e. soaking pits
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/52—Methods of heating with flames
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
Abstract
The invention discloses a method for improving the capacity of a heating furnace of a hot continuous rolling production line, relates to the technical field of industrial furnaces, and solves the technical problem that the capacity of the production line is limited by the heating furnace in the related technology. And a preheating section burner is additionally arranged in the preheating section of the heating furnace so as to change the part of the non-heat-supply section of the preheating section into a heat-supply section. On the basis of the heating section of the heating furnace, which originally has a burner for supplying heat, the length of the heat supply section of the heating furnace is prolonged through a burner of the preheating section; the temperature of a hearth of a preheating section is improved on the original basis, and the slab is quickly heated and heated after being charged, so that the heating speed of the slab is improved, the on-line time of a production line is shortened, and the productivity of a heating furnace is improved; particularly, the method is suitable for improving the heating furnace, particularly realizes the capacity improvement of the heating furnace through local transformation under the condition that the size of the furnace body is not changed, and has the advantages of small local transformation range, strong feasibility and obvious yield increase effect.
Description
Technical Field
The invention relates to the technical field of industrial furnaces, in particular to a method for improving the productivity of a heating furnace of a hot continuous rolling production line.
Background
The capacity design of the heating furnace of the hot continuous rolling production line is based on the whole capacity planning of the production line. After the heating furnace is built and put into operation, the upper limit of the capacity is basically fixed. With the improvement of the process technology and equipment level of the rolling line, the rolling capability can be simultaneously improved. When the capacity of the rolling line is larger than the upper limit of the capacity of the heating furnace, the heating furnace becomes the bottleneck of the production line.
Disclosure of Invention
The application provides a method for improving the productivity of a heating furnace of a hot continuous rolling production line, and solves the technical problem that the heating furnace limits the productivity of the production line in the related technology.
The application provides a method for improving the productivity of a heating furnace of a hot continuous rolling production line.
Optionally, the preheating section burner is used for increasing the temperature of the flue gas discharged from the hearth of the heating furnace by 100-200 ℃.
Optionally, the gas amount distributed by the burner of the preheating section accounts for 7-12% of the total gas amount of the heating furnace.
Optionally, the heating furnace comprises a preheating section, a plurality of heating sections and a soaking section which are arranged in sequence, wherein the heating section is close to the heating section adjacent to the preheating section in the preheating section.
Optionally, the heating furnace comprises a flue and a heat exchanger mounted on the flue; the method also comprises the step of installing a flue evaporator on the flue, arranging the flue evaporator in front of the heat exchanger along the airflow direction when the flue works, and controlling the temperature of the flue gas flowing through the heat exchanger to be within the processing capacity of the heat exchanger through the flue evaporator.
Optionally, a flue evaporator is mounted to the flue, comprising: the original structure of the flue is removed to form an installation position of the flue evaporator, the flue evaporator is arranged at the installation position, and the seam between the flue evaporator and the flue is filled with an aluminum silicate fiber blanket.
Optionally, the fluid output by the flue evaporator is configured for waste heat recovery, and the saturated steam generated by the steam drum is merged into a workshop steam pipe network.
Optionally, the width of the flue evaporator is the same as the width of the flue.
Optionally, the preheating section burner is a flame-adjusting burner.
Optionally, the burners of the preheating section are arranged in a plurality of pairs and symmetrically arranged on the left side and the right side of the preheating section.
The beneficial effects of this application are as follows: the method aims at improving the existing heating furnace, specifically, a certain number of preheating section burners are additionally arranged in a preheating section of the heating furnace, partial areas of a non-heat-supply section of the preheating section are changed into heat-supply sections by additionally arranging the preheating section burners, and the length of a heat-supply section of the heating furnace is prolonged by the preheating section burners on the basis of an original heating section of the heating furnace with the burners for supplying heat; the temperature of the hearth of the preheating section is increased on the basis of the original temperature, and the slab is rapidly heated and heated after being charged, so that the heating speed of the slab is increased, the on-line time of a production line is shortened, and the productivity of a heating furnace is improved; particularly, the method is mainly used for improving the existing heating furnace, particularly realizes the increase of the productivity of the heating furnace through local modification under the condition that the size of the furnace body is not changed, and has the advantages of small local modification range, strong feasibility and obvious yield increase effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly introduced, and it is apparent that the drawings in the description are only some embodiments of the present invention.
FIG. 1 is a schematic view of a conventional heating furnace;
FIG. 2 is a schematic structural diagram of a heating furnace after the improvement of the method for improving the capacity of the heating furnace of the hot continuous rolling production line provided by the present application;
FIG. 3 is a schematic view of an installation site for a flue evaporator provided in a flue duct according to the present application;
FIG. 4 is a schematic illustration of the installation of a flue evaporator provided herein;
fig. 5 is a schematic vertical cross-section of fig. 4.
The attached drawings are marked as follows: 100-preheating section, 110-preheating section burner, 200-heating section I, 300-heating section II, 400-soaking section, 500-flue, 510-heat exchanger, 520-installation position, 521-aluminum silicate fiber blanket and 600-flue evaporator.
Detailed Description
The embodiment of the application provides a method for improving the capacity of a heating furnace of a hot continuous rolling production line, and solves the technical problem that the heating furnace limits the capacity of the production line in the related technology.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for improving the productivity of a heating furnace of a hot continuous rolling production line is characterized in that a preheating section burner is additionally arranged in a preheating section of the heating furnace so as to change a part of a non-heating section of the preheating section into a heating section.
In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.
The capacity design of the heating furnace of the hot continuous rolling production line is based on the whole capacity planning of the production line. After the heating furnace is built and put into operation, the upper limit of the capacity is basically fixed. With the improvement of the process technology and equipment level of the rolling line, the rolling capability can be simultaneously improved. When the capacity of the rolling line is larger than the upper limit of the capacity of the heating furnace, the heating furnace becomes the bottleneck of the production line.
Aiming at the capacity defects of the heating furnace, related technologies relate to the fact that the inventor carries out induction and mainly comprise the following steps: 1) The hot charging and hot delivery proportion of the plate blank is improved, the charging temperature is improved, meanwhile, the adaptability optimization is carried out aiming at the field process system, the heating temperature and the heating time of the product are reduced, and the efficiency of the heating furnace is improved; 2) The refractory material of the furnace body of the heating furnace is maintained, so that the heat loss is reduced, and the efficiency of the heating furnace is improved; 3) Heating load is optimized, burner power is improved, and heating capacity is improved; 4) The mode of 4-furnace production is adopted.
The inventor finds that the improved method at least has the following problems in practical application: 1) The hot charge of the heating furnace designed by the production line can not actually meet the design requirements, for example, the hot charge of the heating furnace designed by the production line accounts for 80% at the hot charge level of more than 800 ℃, and the hot charge of the heating furnace designed by the production line accounts for 50% at the actual level of more than 400 ℃; 2) The heating load of each heating section of the heating furnace is optimized through equipment transformation, the burner power is improved, and the heating capacity is improved, but the heating furnace is limited by the short length of a hearth of the heating furnace, the production of 3 furnaces still cannot match the production demand of a rolling line, and the production of 4 furnaces has the problems of excessive production of the heating furnace and high energy consumption; 3) Through the optimization of a process system, the tapping temperature is gradually reduced to 1200 ℃, certain effect is achieved, but the heating time is limited by the requirement of rolling on the heating quality, and cannot be further shortened after 180min is reached.
Referring to fig. 1 and fig. 2, in the present embodiment, a preheating section burner 110 is added to a preheating section 100 of a heating furnace to change a part of a non-heating section of the preheating section 100 into a heating section.
Specifically, the heating furnace includes a preheating section 100, a plurality of heating sections and a soaking section 400, which are sequentially arranged, and as shown in fig. 1, the heating furnace includes a preheating section 100, a first heating section 200, a second heating section 300 and a soaking section 400, which are sequentially arranged. The area of the furnace where the burners are located may be referred to as a heat supply section, which is generally a heating section or a heating section and a soaking section 400. As shown in fig. 1, the distribution of burners in each section of the heating furnace is shown, which are a soaking section 400 burner, a heating section two 300 upper burner, a heating section two 300 lower burner, a heating section one 200 upper burner and a heating section lower burner.
Referring to fig. 1 and fig. 2, the modification method provided in this embodiment is to add a certain number of burners 110 in the preheating section 100 to change a part of the non-heating section of the preheating section 100 into the heating section. Therefore, on the basis of the original heating section of the heating furnace with the burner for supplying heat, the length of the heat supply section of the heating furnace is prolonged through the preheating section burner 110.
The heating section length of the heating furnace is prolonged, and the advantages of the heating furnace include: the temperature of the hearth of the preheating section 100 is increased on the original basis, and the slab is rapidly heated and heated after being charged, so that the heating speed of the slab is increased, the temperature of the slab passing through the preheating section 100 is increased, the time of the slab on a production line is shortened, and the productivity of a heating furnace is further increased.
Particularly, the modification method provided by the embodiment is suitable for modifying the heating furnace, particularly realizes the capacity improvement of the heating furnace through local modification under the condition that the size of the furnace body is not changed, and has the advantages of small local modification range, strong feasibility and obvious yield increase effect; according to the method, the preheating section 100 is modified, instead of a scheme of directly changing three-furnace production into four-furnace production, so that the requirement on the yield of a rolling line is met, the investment of a fourth furnace is reduced, and the coal gas consumption is obviously reduced.
It can be understood that, in order to solve the problem that the heating furnace limits the capacity of the rolling line, the modification method provided by the embodiment can be applied to the related technologies 1), 2), 3), and 4).
On the basis that the preheating section 100 is provided with the preheating section burner 110 to form a new heat supply section, please refer to fig. 2, the heat supply section can be arranged close to the heating section adjacent to the preheating section 100, and in the specific case of fig. 2, the heat supply section is adjacent to the first heating section 200, so as to form an effect of extending the total heat supply section, which is more beneficial to controlling the heating condition of the slab.
Optionally, the preheating section burner 110 is a flame-adjusting burner, so that the heating degree of the slab in the preheating section 100 is controllable, the increase of the productivity of the heating furnace is finally reflected, the consideration of the gas consumption of the preheating section 100 is also integrated, and the like.
Alternatively, the preheating section burners 110 are arranged in a plurality of pairs, each pair being divided into two parts, i.e., left and right, to form a layout of left and right sides, and the two sides are symmetrically arranged in the preheating section 100.
In one possible embodiment, the associated burner is embodied in the form of: the preheating section burner 110 is a side-burning flame-adjusting burner, the first heating section burner 200 and the second heating section burner 300 are side-burning heat-accumulating burners, the upper part burner of the soaking section 400 is a flat flame, and the lower part burner of the soaking section 400 is a side-burning flame-adjusting burner.
In the method provided by the embodiment, the temperature of the flue gas discharged from the hearth of the heating furnace is increased by 100-200 ℃ by additionally arranging the preheating section burner 110, for example, the flue gas discharged from 750 ℃ before modification is changed into the modified flue gas of 850 ℃.
The heating furnace has a total coal gas amount, which is distributed according to each section to form a distribution proportion of each section, in the case that the method provided by this embodiment is additionally provided with the preheating section burner 110, the total coal gas amount after modification is increased, the distribution of the coal gas amount of each original section remains unchanged, and the coal gas amount distributed by the preheating section burner 110 accounts for 7% -12% of the total coal gas amount of the heating furnace, for example, 7%, 9%, 11%, 12%.
While the above fully describes the arrangement, definition and function of the preheating-stage burner 110, the inventor found that the heat exchanger 510 on the flue 500 of the heating furnace may suffer from the disadvantage that the temperature of the flue gas is too high to exceed the processing capacity of the heat exchanger 510 after the preheating-stage burner 110 is added. In some possible embodiments, referring to fig. 3 to 5, the method further includes installing a flue evaporator 600 in the flue 500, and optionally disposing the flue evaporator 600 near the inlet of the flue 500 before the heat exchanger 510 in the airflow direction during the operation of the flue 500, and controlling the temperature of the flue gas flowing through the heat exchanger 510 within the processing capacity of the heat exchanger 510 by lowering the temperature of the flue gas in the flue 500 through the flue evaporator 600.
For example, the modified forehearth discharges 750 ℃ flue gas and changes into modified 850 ℃ flue gas, so that the temperature of the flue gas is reduced from 850 ℃ to about 750 ℃ through the flue evaporator 600.
In relation to the temperature control, a plurality of temperature measuring holes may be arranged on the flue 500 structure as shown in fig. 3, and the temperature at the corresponding position is measured.
Referring to fig. 3, in the process of installing flue evaporator 600 in flue 500, the original structure of flue 500 is removed, for example, the flue cover plate of flue 500 is removed to form an installation position 520 of flue evaporator 600, flue evaporator 600 is installed in installation position 520, and the seam between flue evaporator 600 and flue 500 is filled with an aluminum silicate fiber blanket 521 to prevent leakage.
Referring to fig. 4, a flue evaporator 600 is provided with a heat exchange tube in a flue 500, and the flue evaporator 600 is correspondingly provided with a circulating water inlet and a circulating water outlet; the heat exchanger 510 is an air heat exchanger 510, and an inlet and an outlet of the air heat exchanger 510 are provided. Generally, high-temperature flue gas exhausted by a heating furnace passes through the heat exchanger pipeline, coal gas or air required by combustion of the heating furnace passes through the heat exchanger pipeline, and heat exchange is formed between the high-temperature flue gas and the heat exchanger pipeline, so that flue gas waste heat is effectively utilized.
Referring to fig. 5, fig. 5 shows that the distribution width of the flue evaporator 600 is the same as the width of the flue 500, and the lower edge of the flue evaporator 600 is spaced from the bottom wall of the flue 500, so as to smoothly discharge the flue gas through the flue 500 without blockage.
Regarding flue evaporator 600, its output carries a large amount of thermal fluid during operation, can carry out waste heat recovery, specifically produces saturated steam through the steam pocket, and saturated steam merges into workshop steam pipe network and utilizes.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The method for improving the capacity of the heating furnace of the hot continuous rolling production line is characterized in that a preheating section burner is additionally arranged on a preheating section of the heating furnace so as to change a part of a non-heating section of the preheating section into a heating section.
2. The method of claim 1, wherein the preheating zone burners are operated to raise the temperature of flue gases exiting the furnace hearth by 100 ℃ to 200 ℃.
3. The method of claim 1, wherein the amount of gas distributed by the burners of the preheating section accounts for 7-12% of the total amount of gas in the furnace.
4. The method of claim 1, wherein the heating furnace comprises the preheating section, a plurality of heating sections, and a soaking section, which are arranged in sequence, in which the heat supply section is adjacent to the heating section adjacent to the preheating section.
5. The method of claim 1, wherein the furnace comprises a flue and a heat exchanger mounted to the flue;
the method further comprises the step of installing a flue evaporator on the flue, wherein the flue evaporator is arranged in front of the heat exchanger along the airflow direction when the flue works, and the temperature of the flue gas flowing through the heat exchanger is controlled within the processing capacity of the heat exchanger through the flue evaporator.
6. The method of claim 5, wherein installing a flue evaporator in the flue comprises:
and removing part of the original structure of the flue to form an installation position of the flue evaporator, wherein the flue evaporator is arranged at the installation position, and the joint of the flue evaporator and the flue is filled by adopting an aluminum silicate fiber blanket.
7. The method of claim 5, wherein the fluid output from the flue evaporator is configured for waste heat recovery and the saturated steam generated by the steam drum is merged into a plant steam pipe network.
8. The method of claim 5, wherein the width of the flue evaporator is the same as the width of the flue.
9. The process of any one of claims 1 to 3, wherein the preheating stage burner is a flame-modulated burner.
10. The method of claim 9, wherein the preheating section burners are arranged in a plurality of pairs and symmetrically arranged in the preheating section in left and right sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211010483.4A CN115323158A (en) | 2022-08-23 | 2022-08-23 | Method for improving productivity of heating furnace of hot continuous rolling production line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211010483.4A CN115323158A (en) | 2022-08-23 | 2022-08-23 | Method for improving productivity of heating furnace of hot continuous rolling production line |
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| CN115323158A true CN115323158A (en) | 2022-11-11 |
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| CN202211010483.4A Pending CN115323158A (en) | 2022-08-23 | 2022-08-23 | Method for improving productivity of heating furnace of hot continuous rolling production line |
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Citations (6)
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| US3623715A (en) * | 1969-02-04 | 1971-11-30 | British Iron Steel Research | Furnace method for reheating billets or slabs |
| CN101314811A (en) * | 2008-07-01 | 2008-12-03 | 秦皇岛首秦金属材料有限公司 | Method for using blast furnace gas to heat of large-scale walking beam type plate blank heating furnace |
| CN102853448A (en) * | 2012-07-05 | 2013-01-02 | 河北省首钢迁安钢铁有限责任公司 | Optimization method for combustion system of slab heat accumulating type heating furnace |
| CN103388071A (en) * | 2012-05-10 | 2013-11-13 | 宝山钢铁股份有限公司 | Hot rolling heating furnace and local strengthening heating control method thereof |
| CN110618715A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Automatic control method for heating furnace soaking section burner |
| CN216514007U (en) * | 2021-11-29 | 2022-05-13 | 北京京诚凤凰工业炉工程技术有限公司 | Bottom furnace of dispersive and staggered circulation heating roller |
-
2022
- 2022-08-23 CN CN202211010483.4A patent/CN115323158A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3623715A (en) * | 1969-02-04 | 1971-11-30 | British Iron Steel Research | Furnace method for reheating billets or slabs |
| CN101314811A (en) * | 2008-07-01 | 2008-12-03 | 秦皇岛首秦金属材料有限公司 | Method for using blast furnace gas to heat of large-scale walking beam type plate blank heating furnace |
| CN103388071A (en) * | 2012-05-10 | 2013-11-13 | 宝山钢铁股份有限公司 | Hot rolling heating furnace and local strengthening heating control method thereof |
| CN102853448A (en) * | 2012-07-05 | 2013-01-02 | 河北省首钢迁安钢铁有限责任公司 | Optimization method for combustion system of slab heat accumulating type heating furnace |
| CN110618715A (en) * | 2018-06-19 | 2019-12-27 | 宝山钢铁股份有限公司 | Automatic control method for heating furnace soaking section burner |
| CN216514007U (en) * | 2021-11-29 | 2022-05-13 | 北京京诚凤凰工业炉工程技术有限公司 | Bottom furnace of dispersive and staggered circulation heating roller |
Non-Patent Citations (1)
| Title |
|---|
| 中国专利局文献部文献馆: "大型火电机组锅炉运行技术问答", 中国专利局文献部文献馆, pages: 1327 - 1328 * |
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